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static long goodSize = 1024;

public void doSomethingWithFile(String filename) {
  long size = new File( filename).length();
  if (size != goodSize) {
    System.out.println("File is wrong size!");
    return;
  }

  try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream( filename)))) {
    // ... work with file
  } catch (IOException e) {
    // Handle error
  } 
}